Glass types — Crystal glass, crystal and lead crystal — Specifications and test methods
This document provides the specifications and specifies the requirements for the designation of three types of glass namely crystal glass, crystal, and lead crystal, according to their chemical composition, density and refractive index. This document also describes the test methods to measure the respective characteristics of these crystal glass types.
Given the potential lead contamination…
Control Units and Accessories for Fire Alarm Systems
Scope
1.1 This Standard covers requirements as related to the following:
a) Discrete electrical control units and accessories for fire alarm systems including smoke control,
releasing, Building System Information Unit (BSIU), and emergency communication systems;
b) Electrically- and electronically-operated amplifiers that provide speech communication and
distinctive sounds in conjunction…
Wearable electronic devices and technologies - Part 401-1: Devices and systems: functional elements ...
IEC 63203-401-1:2023 specifies a measurement method of tensile strain for stretchable, resistive strain sensors. This document describes characterization procedures for evaluation of the gauge factor, linearity, response characteristics, and hysteresis of unimodal tension sensors but is not appropriate for assessment of the physical properties of the sensor material such as the elastic modulus,…
Acoustics — Determination of acoustic properties in impedance tubes — Part 2: Two-microphone techniq...
This test method covers the use of an impedance tube, two microphone locations and a frequency analysis system for the determination of the sound absorption coefficient of sound absorbing materials for normal incidence sound incidence. It can also be applied for the determination of the acoustical surface impedance or surface admittance of sound absorbing materials. As an extension, it can also…
This document specifies the quality requirements, analytical methods, and packaging, labelling, marking, storage and transportation conditions for bee pollen.
This document is applicable to bee pollen collected at the entrance of beehives by Apis mellifera and other bees’ species of colonies, as well as dried, frozen and lyophilized bee pollen.
It does not apply to crushed powdery bee pollen and…